Given that the plane non-zero vector a and vector b satisfy | vector B | = 1 and the angle between vector a and vector b-vector A is 120 °, what is the value range of | vector a | Seeking ideas and results does not need to write too detailed process, thank you | Math enthusiast | Mathematical art

Given that the plane non-zero vector a and vector b satisfy | vector B | = 1 and the angle between vector a and vector b-vector A is 120 °, what is the value range of | vector a | Seeking ideas and results does not need to write too detailed process, thank you

If B-A can be a zero vector, that is, a = B, then the angle between the zero vector and the non-zero vector B is arbitrary. Of course, it can be regarded as 2 π / 3. Draw a unit circle on B, draw a vector from infinity to the end of B, and the angle between B and B is 2 π / 3. Then the end of a is on this line

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